2015 U.S. Open

View highlights of the 2015 U.S. Open Tennis Championships, a hardcourt Grand Slam tournament in New York City, held Aug. 31-Sept. 13, 2015.

Left: Top-seeded Novak Djokovic of Serbia returns a backhand to Roger Federer (2) of Switzerland during their men's singles final match at the U.S. Open Championships tennis tournament in New York, September 13, 2015.

Roger Federer

Roger Federer of Switzerland returns a forehand to Novak Djokovic of Serbia during their men's singles final match at the U.S. Open Championships tennis tournament in New York, September 13, 2015.

Novak Djokovic

Novak Djokovic of Serbia falls to the court while trying to return a shot from Roger Federer of Switzerland in the first set during their men's singles final match at the U.S. Open Championships tennis tournament in New York, September 13, 2015.

Novak Djokovic

Novak Djokovic of Serbia has his elbow tended to after falling while trying to return a shot from Roger Federer of Switzerland in the first set during their men's singles final match at the U.S. Open Championships tennis tournament in New York, September 13, 2015.

Roger Federer

Roger Federer of Switzerland returns a shot to Novak Djokovic of Serbia during their men's singles final match at the U.S. Open Championships tennis tournament in New York, September 13, 2015.

Novak Djokovic

Novak Djokovic of Serbia celebrates winning a point against Roger Federer of Switzerland in their men's singles final match at the U.S. Open Championships tennis tournament in New York, September 13, 2015.

Djokovic defeated Federer in four sets, 6-4, 5-7, 6-4, 6-4.

Novak Djokovic

Novak Djokovic of Serbia jumps into his player's box to be congratulated by family and friends after defeating Roger Federer of Switzerland in their men's singles final match at the U.S. Open Championships tennis tournament in New York, September 13, 2015.

Novak Djokovic

Novak Djokovic of Serbia holds up the U.S. Open trophy after defeating Roger Federer of Switzerland in their men's singles final match at the U.S. Open Championships tennis tournament in New York, September 13, 2015.

Flavia Pennetta

Flavia Pennetta of Italy hits to Roberta Vinci of Italy in the Women's Singles Final on Day 13 of the 2015 U.S. Open tennis tournament, at USTA Billie Jean King National Tennis Center.

Roberta Vinci

Roberta Vinci of Italy serves to compatriot Flavia Pennetta during their women's singles finals match at the U.S. Open Championships tennis tournament in New York, September 12, 2015.

Flavia Pennetta and Roberta Vinci

Flavia Pennetta of Italy (left) comes to the net against compatriot Roberta Vinci during their women's singles final match at the U.S. Open Championships tennis tournament in New York, September 12, 2015.

Pennetta beat Vinci in two sets, 7(7)-6(4), 6-2.

Roberta Vinci and Flavia Pennetta

Flavia Pennetta of Italy (right) holds her U.S. Open Trophy next to compatriot Roberta Vinci during the award presentation ceremony following their women's singles final match at the U.S. Open Championships tennis tournament in New York, September 12, 2015.

Flavia Pennetta

Flavia Pennetta of Italy celebrates with the trophy after beating Roberta Vinci of Italy in the women's singles final on day thirteen of the 2015 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center.

Pierre-Hugues Herbert and Nicolas Mahut

Pierre-Hugues Herbert (left) and Nicolas Mahut of France celebrate match point after defeating Jamie Murray of Britain and John Peers of Australia in the men's doubles final match, 6-4, 6-4, at the U.S. Open Championships tennis tournament in New York, September 12, 2015.

Roger Federer

Roger Federer (2) of Switzerland serves to compatriot Stan Wawrinka (5) during their men's singles semi-final match at the U.S. Open Championships tennis tournament in New York, September 11, 2015. Federer defeated Wawrinka 6-4, 6-3. 6-1.

Novak Djokovic

Top-seeded Novak Djokovic, of Serbia, returns a shot to Marin Cilic (9), of Croatia, during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. Djokovic won 6-0, 6-1, 6-2.

Roberta Vinci

Roberta Vinci of Italy celebrates after defeating Williams during their singles semi-finals match on Day Twelve of the U.S. Open at the USTA Billie Jean King National Tennis Center. Vinci defeated Williams 2-6, 6-4, 6-4.

Serena Williams

Serena Williams of the U.S. gets up slowly from the court in the third set against Roberta Vinci of Italy during their women's singles semi-final match at the U.S .Open Championships tennis tournament in New York City, September 11, 2015.

The 43rd-ranked Vinci won the second and third sets, ending Williams' bid for the Grand Slam. It was Vinci's first Grand Slam semi-final, leading to an all-Italian final September 12 with Vinci taking on fellow country woman Flavia Pennetta.

Roberta Vinci

Roberta Vinci of Italy celebrates winning the second set against Serena Williams of the U.S. during their women's singles semi-final match at the U.S. Open Championships tennis tournament in New York, September 11, 2015.

Tennis Greats

From left: The original six women professional tennis players Billie Jean King, Valerie Ziegenfuss, Nancy Richey, Kerry Melville Reid, Judy Tegart Dalton and Rosie Casals pose on Day Twelve of the 2015 U.S. Open at the USTA Billie Jean King National Tennis Center in New York City on September 11, 2015

Flavia Pennetta

Flavia Pennetta of Italy returns a shot to Simona Halep of Romania during their semi-final match on Day Twelve of the 2015 U.S. Open in New York City on September 11, 2015. Pennetta, seeded 26th, defeated No. 2 Halep 6-1, 6-3 in an upset. Panetta has never advanced to a Grand Slam singles final until her victory over Halep.

Simona Halep

Simona Halep of Romania chases down a forehand to Flavia Pennetta of Italy during their women's semi-final match at the U.S. Open tennis tournament in New York City, September 11, 2015. Pennetta defeated Halep 6-1, 6-3 to enter the finals.

Flavia Pennetta

Flavia Pennetta (26) of Italy reacts after losing a point to Petra Kvitova (5) of the Czech Republic during their quarterfinals match at the U.S. Open Championships tennis tournament in New York, September 9, 2015.

Pennetta ended up defeating Kvitova 4-6, 6-4, 6-2.

Serena and Venus

Serena Williams (left) and her sister, Venus Williams, trade volleys during their quarterfinals match at the U.S. Open Championships tennis tournament in New York, September 8, 2015.

Serena Williams

Serena Williams of the U.S. returns a shot to her sister and compatriot Venus Williams during their quarterfinals match at the U.S. Open Championships tennis tournament in New York, September 8, 2015. Serena won the match 6-2, 1-6, 6-3.

Serena and Venus Williams

Serena Williams of the U.S. (right) embraces her sister and compatriot Venus Williams after defeating her in their quarterfinals match at the U.S. Open Championships tennis tournament in New York, September 8, 2015.

Feliciano Lopez

After Fabio Fognini defeated Rafael Nadal, he in turn lost to Feliciano Lopez (18) of Spain on Day Seven of the 2015 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, September 6, 2015. Lopez won 6-3, 7-6 (5), 6-1.

Roberto Bautista Agut

Spain's Roberto Bautista Agut (23) hits the ball during his fourth round match against Serbia's Novak Djokovic (1) at the U.S. Open Championships tennis tournament in New York, September 6, 2015.

Serena Williams

Serena Williams (1) of the U.S. chases down a return to compatriot Madison Keys (19) during their fourth round match at the U.S. Open Championships tennis tournament in New York, September 6, 2015.

Novak Djokovic

Novak Djokovic (1) of Serbia reacts after winning a game against Roberto Bautista Agut (23) of Spain on day seven of the 2015 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, September 6, 2015.

Their three-hour long match ended with Djokovic winning 6-3, 4-6, 6-4, 6-3, moving him to a 26th consecutive grand slam quarter-final.

Ekaterina Makarova

Ekaterina Makarova (13) of Russia serves against Kristina Mladenovic of France on day seven of the 2015 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, September 6, 2015. Makarova lost the fourth round match.

Roger Federer

Left: Roger Federer (2) of Switzerland serves to Philipp Kohlschreiber (29) of Germany during their match at the U.S. Open Championships tennis tournament in New York, September 5, 2015.

Andy Murray

Andy Murray (3) of Britain returns a shot to Thomaz Bellucci (30) of Brazil of the U.S. during their third round match at the U.S. Open Championships tennis tournament in New York, September 5, 2015.

Simona Halep

Simona Halep (2) of Romania celebrates a point against Shelby Rogers of the U.S. during their third round match at the U.S. Open Championships tennis tournament in New York, September 5, 2015.

Serena Williams

Serena Williams of the U.S. celebrates a point against Bethanie Mattek-Sands of the U.S. during their match at the U.S. Open Championships tennis tournament in New York, September 4, 2015.

Flushing Meadows

A fan watches from above during the match between Coco Vandeweghe of the U.S. and compatriot Sloane Stephens at the U.S. Open Championships tennis tournament in New York, August 31, 2015.

Kei Nishikori

Kei Nishikori (4) of Japan returns a shot to Benoit Paire of France at the USTA Billie Jean King National Tennis Center. Kishikori lost the first round match.

Rafael Nadal

Rafael Nadal (8) of Spain returns the ball during his match with Fabio Fognini (32) of Italy at the U.S. Open Championships tennis tournament in New York, September 4, 2015.

Nadal, who won the U.S. Open in 2010 and 2013, was knocked out of the tournament.

Stan Wawrinka

The shadow of Stan Wawrinka (5) of Switzerland shows on the court as he plays Hyeon Chung of South Korea during their second round match at the U.S. Open Championships tennis tournament in New York, September 3, 2015.

Petra Kvitova

Petra Kvitova (5) of the Czech Republic serves against Anna Karolina Schmiedlova (32) of Slovakia on Day Six of the 2015 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, September 5, 2015. Kvitova won 6-2, 6-1.

Fabio Fognini

Fabio Fognini (32) of Italy gestures after winning a point against Rafael Nadal of Spain on Day Five of the 2015 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, September 4, 2015. After dropping the first two sets (3-6, 4-6), Fognini defeated Nadal in the final three (6-4, 6-3, 6-4).

Roger Federer

Roger Federer (2) of Switzerland is seen past the legs of an umpire as he serves to Steve Darcis of Belgium during their second round match at the U.S. Open Championships tennis tournament in New York, September 3, 2015.

Jimmy Fallon and Justin Timberlake

"Tonight Show" host Jimmy Fallon and actor-singer Justin Timberlake react to being shown on a video screen as they attend the quarterfinals match between Roger Federer of Switzerland and Richard Gasquet of France at the U.S. Open Championships tennis tournament in New York, September 9, 2015.

Tomas Berdych

Tomas Berdych (6) of Czech Republic returns a shot to Jurgen Melzer of Austria on Day Four of the 2015 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, September 3, 2015.

Garbine Muguruza and Johanna Konta

The Day Four match between Garbine Muguruza (9) of Spain (top) and Johanna Konta of Great Britain was, at 3 hours 23 minutes, the longest women's match in U.S. Open history. Muguruza was defeated 7-6, 6-7, 6-2.

Donald Trump

Donald Trump on Day Nine of the 2015 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center.

Venus Williams

Venus Williams (23) of the U.S. returns a shot to Anett Kontaveit of Estonia during their fourth round match at the U.S. Open Championships tennis tournament in New York, September 6, 2015.

Marin Cilic

Marin Cilic (9) of Croatia hits the ball to Jeremy Chardy (27) of France during their fourth round match at the U.S. Open Championships tennis tournament in New York, September 6, 2015. Cilic won 6-3, 2-6, 7-6, 6-1.

Oprah Winfrey and Gayle King

Television personalities Oprah Winfrey (left) and Gayle King watch as Serena Williams of the U.S. plays against her sister and compatriot Venus Williams in their quarterfinals match at the U.S. Open Championships tennis tournament in New York, September 8, 2015.

Alex Baldwin

Actor Alec Baldwin attends the quarterfinals match between Roger Federer of Switzerland and Richard Gasquet of France at the U.S. Open Championships tennis tournament in New York, September 9, 2015. Federer won 6-3-, 6-3, 6-1.

Victoria Azarenka

Victoria Azarenka (20) of Belarus celebrates after winning the first set against Angelique Kerber (11) of Germany during their third round match at the U.S. Open Championships tennis tournament in New York, September 5, 2015.

On Tuesday, Sept. 1, during her match against Lucie Hradecka, Azarenka traded words with chair umpire Aurelie Tourte at Louis Armstrong Stadium:

Azarenka: "Have you ever played tennis?"
Tourte: "Yes."
Azarenka: "You did? You probably weren't very good."

Azarenka won 6-1, 6-2.

Eugenie Bouchard

Eugenie Bouchard of Canada (pictured during her winning match against Dominika Cibulkova of Slovakia on September 4), withdrew from the competition after suffering a concussion in a locker room accident later that same day.

Jack Sock

Jack Sock (28) of the U.S. is tended to by medical personnel after collapsing on the court during play against Ruben Bemelmans of Belgium, during the second round of the U.S. Open tennis tournament, Thursday, September 3, 2015, in New York. Sock retired, with the final score 4-6, 4-6, 6-3, 2-1.

Caroline Wozniacki

Caroline Wozniacki (4) of Denmark serves to Petra Cetkovska of Czech Republic on Day Four of the 2015 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, September 3, 2015. Wozniacki lost 6-4, 5-7, 7-6.

Serena Williams

Serena Williams (1) of the U.S. signs autographs after defeating Kiki Bertens of the Netherlands in their second round match at the U.S. Open Championships tennis tournament in New York, September 2, 2015.

Bradley Cooper

Actor Bradley Cooper (left) attends the quarterfinals match between Roger Federer of Switzerland and Richard Gasquet of France at the U.S. Open Championships tennis tournament in New York, September 9, 2015.

Coco Vandeweghe

Coco Vandeweghe of the United States smashes her racquet on the court between games against Bethanie Mattek-Sands during the second round of the U.S. Open tennis tournament, Wednesday, September 2, 2015, in New York. Coco Vandeweghe lost to Mattek-Sands, 6-2, 6-1.

Mona Barthel

Mona Barthel of Germany signs autographs for fans after being defeated by Varvara Lepchenko of the U.S. in their third round match at the U.S. Open Championships tennis tournament in New York, September 5, 2015.

U.S. Open

Television personalities and models Kendall Jenner (second from left) and Gigi Hadid (third from left) and singer Joe Jonas (right) watch as Serena Williams of the U.S. plays against her sister and compatriot Venus Williams in their quarterfinals match at the U.S. Open Championships tennis tournament in New York, September 8, 2015.

Kim Kardashian

Television personality Kim Kardashian (center) watches as Serena Williams of the U.S. plays against her sister and compatriot Venus Williams in their quarterfinals match at the U.S. Open Championships tennis tournament in New York, September 8, 2015.

David Ferrer

David Ferrer (7) of Spain serves to Radu Albot of Moldova during their match at the U.S. Open Championships tennis tournament in New York, August 31, 2015.

Ferrer was knocked out in his third round match against Jeremy Chardy (27) of France, 7-6, 4-6, 6-3, 6-1.